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Test on Alterable Mode Biochemical Pretreatment for Municipal Wastewater Treatment

Author: LiMin
Tutor: ZhangBeiPing
School: Huazhong University of Science and Technology
Course: Municipal Engineering
Keywords: Urban sewage Facultative Biochemical Bio - enhanced flocculation Synergy Nitrogen and phosphorus removal
CLC: X703
Type: Master's thesis
Year: 2005
Downloads: 57
Quote: 1
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Abstract


This paper studies the urban sewage treatment biological / ecological type combination process variable mode processing unit technology. Pre-treatment unit in two modes, namely facultative the biochemical mode with biological strengthen the transition between flocculation mode. The early facultative biochemical mode orthogonal pilot study on the basis of further research is divided into two modes, three pilot phase. The biochemical mode research facultative, facultative biochemical reactions critical temperature of 13 ° C low temperature (13 ° C or less), the best conditions and pre-constant conditions at room temperature (13 ℃ constant conditions -24 ℃) test, the observation of the two states, COD, NH 3 -N, TN, TP variation, the test found that facultative biochemical reactions organics water maintained at between 60-80mg / L can meet the requirements of the subsequent ecological treatment, the lower the effect of nitrogen and phosphorus removal, its main reason analysis and improvement ideas. Room temperature, the inside and outside of the reactor and the carbon source, and found that the removal of each index rose by 10% -20%, and found that the optimal dosing dosing sucrose as a facultative biochemical external carbon source should reach the influent COD was 400mg / L. The bioaugmentation Flocculation mode improve the lack of low temperatures facultative biochemical mode. The test uses the form of the beaker test. First, the low temperatures of urban sewage coagulation test, get the best coagulant and the coagulation control parameters, the best coagulant PAC, the best dosage of 30mg / L, the best stirring conditions for rapid The stirring intensity n 1 = 150r/min, medium-speed stirring n 2 = 80r/min, slow stirring n 3 = 30r/min; corresponding stirring time t1 = 0.5min, t2 = 5min, t3 = 15min. Flocculant is then added to the mixture of facultative biological sludge and sewage, the strengthening effect of the investigated coagulant and flocculant and facultative organisms synergy. It was found that the PAC dosage of 20mg / L, the residence time of 8h achieve the best level of response, the biological sludge and sewage mixture by the COD removal efficiency of 69.50% after coagulation than pure sewage coagulation system and a simple bioreactor system increased by 15%; biological sludge and sewage mixture after after coagulation TP removal rate reached 50.85%, about 20% higher than the a simple sewage coagulation system with simple bioreactor system; coagulants and biological denitrification on did not show a synergistic effect.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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